PICK1 Interacts with ABP/GRIP to Regulate AMPA Receptor Trafficking

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PICK1 Interacts with ABP/GRIP to Regulate AMPA Receptor Trafficking Wei Lu, Edward B. Ziff  Neuron  Volume 47, Issue 3, Pages 407-421 (August 2005) DOI: 10.1016/j.neuron.2005.07.006 Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 1 Regulation of the PICK1 Intramolecular Interaction (A) Schematics of PICK1 and PICK1 mutants. (B) Immunostaining (right panel) of HeLa cells expressing PICK1 (top), PICK1 plus GluR2 (GluR2 fluorescence not shown) (middle), or Δ121 (bottom). Left panel shows the transmission images. (C) Colocalization of 135Δ and Δ121 in HeLa cells. Top and middle panels show the localization when 135Δ or Δ121 was transfected on their own, respectively. Bottom panel shows the colocalization when Δ121 and 135Δ were cotransfected. Left panel shows the transmission images. (D and E) CoIP of Δ121 with 135Δ from 293T cells. Lysates from cells transfected with 135Δ-Flag or/and Δ121-Myc were precipitated with an anti-Flag (D) or an anti-Myc (E) antibody. The IPs and 10% input were probed with indicated antibodies. (F) A direct PICK1 PDZ-BAR domain interaction. Purified His6-135Δ was incubated with GST or GST-BAR. Bound proteins were detected by IB with an anti-His6 antibody. Bottom panel shows the Ponceau S staining, indicating GST species. (G) Disruption of the PICK1 intramolecular interaction by peptides from PKCα and GluR2 C termini. (Gi) Peptides (2–6) used in the experiment. (Gii) Peptides that bind to the PICK1 PDZ domain disrupt the PICK1 PDZ-BAR domain interaction. Lysates from cells cotransfected with 135Δ and Δ121 were divided equally to incubate with peptides shown in (Gi) or the vehicle, DMSO, for 30 min at RT. IP and IB were then performed as indicated. (Giii) Peptide that binds to the PICK1 PDZ domain did not induce obvious degradation of the PICK1 PDZ and BAR domains. Equal amount of lysates from 293T cells expressing 135Δ and Δ121 was incubated with DMSO or PKCα C-terminal peptide for 30 min at RT. Lysates were then probed with indicated antibodies. (Giv) Data from three experiments were quantitated by scanning densitometry. The bars numbered 1–6 correspond to DMSO or peptide treatments shown in (Gi and Giii). Values are relative to DMSO control (n = 3, t test, *p < 0.0001). Bar graph shows mean ± SD. (H) Dose-dependent disruption of the PICK1 PDZ-BAR domain interaction by peptide that binds to the PICK1 PDZ domain. Different amounts of peptide were incubated with aliquots of lysates from cells expressing 135Δ and Δ121 as described above. IP and IB were then performed as indicated. (I) PICK1 contains a BAR domain. (Ii) The molecular model of the PICK1 BAR domain. This model is based on the analog to the arfaptin2 BAR domain. Two basic residues (K251, K252, red) in the concave face of the PICK1 BAR domain were mutated into glutamate. (Iii) Immunostaining of Δ121 or Δ121 (KK-EE) expressed individually in HeLa cells. Compared with the cluster distribution of Δ121 (left), Δ121 (KK-EE) was diffuse in the cytoplasm (right). (Iiii) The KK251/252EE mutant is capable of forming dimers. Δ121 (KK-EE) mutants tagged with Flag or Myc were cotransfected into 293T cells. CoIP and IB experiments were performed as indicated. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 2 PICK1 Colocalizes with GRIP/ABP and Binds to GRIP/ABP In Vitro (A) GRIP but not PSD-95 colocalizes with Δ121 in HeLa cells. GRIP and PSD-95 were either expressed alone (left) or coexpressed (right) with Δ121. When coexpressed with Δ121, GRIP, but not PSD-95, colocalized with Δ121 in large perinuclear clusters. (B) Immunostaining of HeLa cells cotransfected with different GRIP mutants and Δ121. (C) A 55 aa sequence in ABP LII mediates the interaction with Δ121. (Ci) Schematics of GST-ABP mutants. “SP” refers to the alternative “splicing point”. (Gii and Giii) Lysates from 293T cells expressing Δ121 were divided equally to bind to GST alone, GST-ABP mutants, or a GST-GRIP mutant containing LII ([Cii], right). Bound proteins were detected by IB. 10% input of Δ121 was also shown (Civ). (D) The 55 aa Br of ABP were aligned with the same region of GRIP. There is an 82% similarity between ABP and GRIP in the marked region. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 3 PICK1 Interacts with GRIP In Vivo and Colocalizes with GRIP in Cultured Hippocampal Neurons (A) PICK1 interacts with GRIP in 293T cells. (Ai) Schematics of PICK1 and PICK1 mutants. (Aii) GRIP was expressed alone or together with PICK1 and PICK1 mutants. Cell lysates were subjected to IP and IB assays with indicated antibodies. (B) PICK1 associates with GRIP in rat brain tissue. Rat brain cortex homogenates were precipitated with a control IgG or an anti-GRIP antibody (Bi) and a control IgG or an anti-PICK1 rabbit antibody (Bii). Bound proteins were detected by IB. (C–G) Immunostaining of neurons expressing Δ121(C), PICK1 (D), or GRIP (E) or coexpressing GRIP and Δ121 (F1–F3) and GRIP and PICK1 (G1–G3). Scale bar, 20 μm. The GRIP construct used in this experiment is the nonpalmitoylated isoform. White boxes in panels (C)–(G) define enlargements shown in lower panels. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 4 Δ121, GRIP, and GluR2 Colocalize in HeLa Cells and Form a Complex In Vitro (A) When cells were cotransfected with GluR2 and Δ121 (top panel), GluR2 did not colocalize with Δ121. When cells were triple transfected with GRIP, GluR2, and Δ121 (middle panel), three proteins formed perinuclear clusters. When cells were triple transfected with GRIP, GluR2-AVKI, and Δ121 (bottom panel), GluR2-AVKI did not colocalize with the coclusters of GRIP and Δ121. (B) Δ121, GRIP, and GluR2 form a complex in vitro. Lysates from 293T cells expressing GRIP or Δ121 or both GRIP and Δ121 were divided equally to bind to GST alone or GST-GluR2-SVKE or GST-GluR2C as indicated. Bound proteins were detected by IB. (C) Colocalization of Δ121 or PICK1 with GRIP in HeLa cells. Δ121 (top panel) or PICK1 (bottom panel) was coexpressed with GRIP. Compared with Δ121, PICK1 only partially colocalized with GRIP. (D) Peptide that binds to the PICK1 PDZ domain enhances the PICK1-ABP/GRIP association. Lysates from 293T cells expressing PICK1 were divided equally to incubate with GST or GST-Br in the absence or presence of the peptide as indicated. Bound proteins were probed with an anti-Flag antibody. Data from three experiments were quantitated by scanning densitometry (n = 3, t test, *p < 0.001). Bar graph shows mean ± SD. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 5 The Br Suppresses S880 Phosphorylation of GluR2 (A) ECFP-Br colocalizes with Δ121 or PICK1 in HeLa cells. When expressed alone, ECFP-Br was diffuse (A1). When coexpressed with Δ121 (A2) or PICK1 (A3), ECFP-Br colocalized with them. (B) Expression of ECFP-Br suppresses S880 phosphorylation of GluR2 in hippocampal cultures. Neurons expressing ECFP-Br or EGFP-NT or that were uninfected were treated with DMSO or TPA for 15 min. Neurons were then lysed and lysates were subjected to IB. Data from three experiments were quantitated by scanning densitometry (n = 3, t test, *p < 0.001). Bar graph shows mean ± SD. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 6 Interference with the PICK1-ABP/GRIP Interaction Impairs the Surface Expression of Endogenous GluR2 but Not GluR1 (A and B) Neurons expressing Δ121-Flag were stained live with an anti-GluR2 (A) or an anti-GluR1 (B) antibody to detect surface GluR2 or GluR1, respectively. Neurons were then permeabilized to detect Δ121-Flag. Scale bar, 20 μm. White boxes in each triplet of upper panels define enlargements shown in lower panels. (C) Quantitation of surface levels of GluR2 (Ci) or GluR1 (Cii) on neurons shown in (A) or (B) (n = 45 for GluR2, n = 22 for GluR1, t test, *p < 0.001). (D and E) Neurons expressing ECFP-Br were stained live with an anti-GluR2 (D1–D3) or an anti-GluR1 (E1–E3) antibody to detect surface GluR2 or GluR1. Scale bar, 20 μm. White boxes in each triplet of upper panels define enlargements shown in lower panels. (F) Quantitation of surface levels of GluR2 (Fi) or GluR1 (Fii) shown in (D) or (E) (n = 59 for GluR2, n = 27 for GluR1, t test, *p < 0.001). (G) Quantitation of surface levels of GluR2 or GluR1 in neurons expressing EGFP-NT (images now shown) (n = 27 for GluR1, n = 32 for GluR2, t test). (H–N) Total GluR2 level was not significantly affected in neurons expressing the dominant-negative constructs. Neurons expressing Δ121 (H) or ECFP-Br (I) were stained with indicated antibodies. Quantitation of total GluR2 in neurons expressing Δ121 (n = 10) or ECFP-Br (n = 10) (J). Scale bar, 20 μm. Neurons uninfected or infected with high-titer Sindbis virus expressing ECFP-Br (K) or EGFP-NT (K) or Δ121 (M) were lysed with 1% Triton X-100 buffer, and lysates were subjected to IB with indicated antibodies. Data from three repeats were quantitated by scanning densitometry, respectively (n = 3, t test, p > 0.05) (L and N). Bar graphs in (C), (F), (G), and (H)–(N) show mean ± SD. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 7 The PICK1-ABP/GRIP Interaction Functions in GluR2 Recycling and the NMDA-Induced Endocytosis of GluR2 (A–D) Expression of ECFP-Br, but not EGFP-NT, impaired GluR2 recycling. Neurons uninfected (A1–A3) or infected with Sindbis virus expressing EGFP-NT (B1–B4) or ECFP-Br (C1–C4) were stained live with an anti-GluR2 antibody, followed by treatment of NMDA. Neurons were then returned back to growth media for 45 min. Recycled and internalized GluR2 were sequentially labeled with Rhodamine (under unpermeabilized condition) and Cy5 (under permeabilized condition) conjugated secondary antibodies, respectively. Scale bar, 20 μm. (D) Quantitation of the ratio of recycled to internalized GluR2 in neurons expressing EGFP-NT (B1–B4) (n = 14, t test, p > 0.05) or ECFP-Br (C1–C4) (n = 16, t test, *p < 0.001), respectively. (E–H) Expression of ECFP-Br, but not EGFP-NT, impaired NMDA-induced endocytosis of GluR2. Neurons uninfected (E1–E3) or infected with Sindbis virus expressing EGFP-NT (F1–F4) or ECFP-Br (G1–G4) were stained live with an anti-GluR2 antibody, followed by treatment of NMDA. Surface and internalized GluR2 were sequentially labeled with Cy5 (under unpermeabilized condition) and Rhodamine (under permeabilized condition) conjugated secondary antibodies, respectively. Scale bar, 20 μm. (H) Quantitation of the ratio of internalized to surface GluR2 in neurons expressing EGFP-NT (F1–F4) (n = 13, t test, p > 0.05) or ECFP-Br (G1–G4) (n = 23, t test, *p < 0.001), respectively. Bar graphs in (D) and (H) show mean ± SD. Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 8 Model for the Role of the PICK1-ABP/GRIP Interaction in AMPAR Trafficking GluR2 receptors are anchored at synaptic and intracellular membranes by ABP/GRIP but undergo cycling between these membranes in association with PICK1. Trafficking of GluR2 receptors from ABP/GRIP anchorage requires the PICK1-ABP/GRIP interaction. Activation of PKCα (1) causes PKCα to bind to the PICK1 PDZ domain, which disrupts the PICK1 PDZ-BAR domain interaction and leads to the exposure of the PICK1 BAR domain (2). The PICK1-PKCα complex is targeted to the ABP/GRIP-GluR2 complex through the interaction of the exposed BAR domain with the Br sequence of ABP/GRIP (3). PICK1 competes with ABP/GRIP for the GluR2 interaction (4). PKCα phosphorylates S880 of GluR2. GluR2 phosphorylated at S880 cannot bind back to ABP/GRIP (5) but is able to bind to PICK1 (6). The PICK1 BAR domain directs the PICK1-GluR2 complex to curved membranes (7), where GluR2 receptors bud from the plasma membrane and internalize or bud from an internal membrane prior to reinsertion into synapses (8). Neuron 2005 47, 407-421DOI: (10.1016/j.neuron.2005.07.006) Copyright © 2005 Elsevier Inc. Terms and Conditions